PVC extrusion mold paste may be the first mold design unreasonable. There may be dead ends runners, PVC plastic long-term accumulation does not flow in this dead end, it is easy to paste.

1. Mold temperature is too high is the reason!

2. Process improper operation, the general case of this situation. I personally think that barrel temperature can be properly increased. However, the transition period, the oil temperature can be properly reduced, and the mold temperature is also reduced.